01e9cb7e23
Co-authored-by: Y. Srinivas Ramakrishna <ysr1729@gmail.com> Reviewed-by: sjohanss, tschatzl
71 lines
2.6 KiB
Java
71 lines
2.6 KiB
Java
/*
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* Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.testlibrary;
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import sun.jvmstat.monitor.Monitor;
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import sun.jvmstat.monitor.MonitorException;
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import sun.jvmstat.monitor.MonitoredHost;
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import sun.jvmstat.monitor.MonitoredVm;
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import sun.jvmstat.monitor.VmIdentifier;
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import jdk.test.lib.process.ProcessTools;
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/**
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* PerfCounters can be used to get a performance counter from the currently
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* executing VM.
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*
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* Throws a runtime exception if an error occurs while communicating with the
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* currently executing VM.
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*/
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public class PerfCounters {
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private final static MonitoredVm vm;
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static {
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try {
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String pid = Long.toString(ProcessTools.getProcessId());
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VmIdentifier vmId = new VmIdentifier(pid);
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MonitoredHost host = MonitoredHost.getMonitoredHost(vmId);
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vm = host.getMonitoredVm(vmId);
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} catch (Exception e) {
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throw new RuntimeException("Could not connect to the VM");
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}
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}
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/**
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* Returns the performance counter with the given name.
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*
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* @param name The name of the performance counter.
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* @throws IllegalArgumentException If no counter with the given name exists.
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* @throws MonitorException If an error occurs while communicating with the VM.
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* @return The performance counter with the given name.
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*/
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public static PerfCounter findByName(String name)
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throws MonitorException, IllegalArgumentException {
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Monitor m = vm.findByName(name);
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if (m == null) {
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throw new IllegalArgumentException("Did not find a performance counter with name " + name);
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}
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return new PerfCounter(m, name);
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}
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}
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